Methods and apparatus for control of non-invasive parameter measurements

A method of operating a hemodynamic parameter measurement apparatus adapted for use on a living subject and having one or more sensors in contact with tissue overlying a blood vessel, the method comprising:

• operating said apparatus in a non-transient mode, wherein data relating to one or more hemodynamic parameters is obtained using said one or more sensors;
• detecting at least one transient event using said obtained data;
• and
• operating said apparatus in a transient recovery mode subsequent to said detection of said event so as to compensate for said transient event.

An apparatus for use in transient event compensation during hemodynamic parameter measurement from a living subject, comprising:

• first apparatus adapted to establish an initial substantially optimal state of coupling to said living subject;
• a sensor adapted to obtain data relating to said hemodynamic parameter from said subject;
• and
• a computing apparatus having a computer program configured to run thereon, which when executed:
• cause said data to be received from said sensor;
• detect the occurrence of a transient event by analyzing changes in said data, said transient event altering the mechanical coupling between said subject and sensor;
• cease use of said data from said sensor;
• identify a second substantially optimal state of coupling of said sensor to said subject;
• and
• resume using said data from said sensor after said second state has been achieved.

A non-invasive physiologic measurement apparatus, comprising:

• a sensor adapted to measure a physiologic parameter originating from a living subject;
• a sensor control apparatus operatively coupled to said sensor;
• and
• a controller in signal communication with said sensor and said sensor control apparatus and configured to:
• operate in a first mode to collect data using said sensor;
• detect at least one instance of said collected data being unreliable;
• upon detection of said unreliable data, operate in a second mode to cease at least one of collection and/or use of said data for at least a period during which said data is unreliable;
• and
• upon completion of said period during which said data is unreliable, operate in a third mode to resume collection and/or use of said data from said sensor.

A non-invasive hemodynamic measurement system, comprising:

• a sensor adapted to measure at least one hemodynamic parameter;
• control apparatus operatively coupled to said sensor;
• a controller in signal communication with said sensor and said control apparatus, said controller capable of
• generating a waveform related to hemodynamic data obtained from said sensor;
• identifying at least one artifact within said waveform, said at least one artifact indicating unreliability of said hemodynamic data,
• subsequent to identifying said unreliability, ceasing utilizing said hemodynamic data collected from said sensor to generate said waveform;
• and
• at a termination of said unreliability, restarting utilization of said hemodynamic data collected from said sensor to generate said waveform.

A method of operating a hemodynamic assessment apparatus adapted for use on a living subject and having a sensor, the method comprising:

• collecting hemodynamic parameter data using said sensor coupled to tissue of said subject;
• utilizing said data to determine a pressure value of interest of said living subject;
• detecting the occurrence of a transient event by analyzing changes in said data, said transient event adversely affecting said coupling;
• ceasing collection of said data from said sensor;
• and
• resuming receiving said hemodynamic parameter measurement data from said sensor upon termination of said transient event and re-establishing adequate coupling of said sensor to said tissue.